eSIM vs Local SIM vs Roaming: What's Cheapest Abroad?

The three ways to get data abroad

When you land in another country you can keep using your home plan and pay for roaming, buy a physical SIM card from a local operator, or install a travel eSIM before you leave. They all end up at the same place, a working data connection, but they differ in cost, effort, risk and what happens to your own number.

This guide compares them honestly. Each has situations where it is the best option, including roaming, which has a worse reputation than it deserves in some regions. We sell travel eSIMs, so keep that in mind, but the arithmetic below is yours to check.

Option one: roaming on your home plan

Roaming means your home carrier lets you use a partner network abroad and bills you for it. The experience is seamless, because nothing changes on your phone, and you keep your number for calls, texts and verification codes.

The cost depends completely on your plan. Within some regions, such as between European Union countries under the regulations in force there, roaming at home rates is often included, with fair-use limits. Many carriers also sell daily travel passes that let you use your normal allowance abroad for a flat daily fee. Outside those arrangements, standard roaming charges can be very high, and a single careless day of background data can produce a painful bill.

Roaming is the right choice for short trips inside an included zone, for people whose employer pays, and for anyone who values zero setup above price. It is the wrong choice for anything long, remote, or outside a zone your plan covers.

• Pros: no setup, keep your number, works immediately.
• Cons: can be extremely expensive outside included zones, bill shock from background data, daily passes add up on longer trips.

Option two: a local physical SIM

A local SIM is a prepaid card from an operator in the country you are visiting. It usually offers the best price per gigabyte, particularly in countries with cheap domestic data, and it can come with a local phone number for calls and local services.

The costs are time and friction. You have to find a shop or kiosk, queue, show a passport in many countries, and sometimes wait for registration. Airport prices are often higher than in town, and the tourist plans on offer are not always the best ones. You also have to swap your physical SIM, which means your home number is unreachable unless you have a dual-SIM phone, and you risk losing the tiny card you removed.

A local SIM makes sense for long stays, for people who need a local number, and in countries where tourist eSIMs are expensive or unavailable. It is a weaker choice for a short trip where an hour in a queue costs more than you save.

• Pros: often the lowest price per gigabyte, local number, strong local support.
• Cons: time spent buying it, passport registration in some countries, swapping SIMs, losing access to your home number on single-SIM phones.

Option three: a travel eSIM

A travel eSIM is a digital SIM you buy online and install on your phone before you travel. It connects to a local network when you arrive, so you get data immediately without visiting a shop, and your home SIM stays in the phone for calls and texts.

The price sits between the extremes. It is usually far cheaper than roaming outside included zones, and usually a little dearer per gigabyte than a local SIM bought in town, but you pay for convenience: you can have data the moment you land, with nothing to queue for. Most travel eSIMs are data-only, which is fine for messaging apps and maps but means no local number.

The main limits are compatibility and number access. You need an eSIM-capable, unlocked phone, and the plan generally does not give you a local phone number for receiving calls or SMS verification codes.

• Pros: instant data on arrival, no queues, keep your home number active, install before you leave.
• Cons: needs a compatible unlocked phone, usually data-only, slightly dearer per gigabyte than a local SIM.

A simple way to compare the cost

Prices change, so we cannot print a universal winner. Use this calculation with real numbers for your trip. For each option, work out the total cost of the data you need, plus the cost of your time.

Start by estimating your data: light use is roughly 0.3 to 0.5 GB a day, moderate is 1 to 2 GB, heavy is 3 GB or more. Multiply by your trip length. For roaming, check your carrier's daily pass price and multiply by the days, or its per-megabyte rate if you have no pass. For a local SIM, find the tourist plan price for that data and add a value for your time, say an hour at whatever your time is worth. For an eSIM, look up the total price for the same data and days.

Then compare the totals. In our experience the pattern is consistent. For trips of a few days inside a roaming-friendly zone, roaming can be fine. For short and medium trips outside such zones, an eSIM wins on total effort-adjusted cost. For long stays or when you need a local number, a local SIM often wins.

Factors the price comparison misses

A few non-price considerations often decide the choice in practice.

• Arrival: with an eSIM you can have maps working while you queue at immigration, and book your ride before you reach the taxi rank.
• Safety: keeping your home SIM in place means your bank and two-factor codes still arrive, which matters if you use SMS verification.
• Dual-SIM: most eSIM phones can keep a physical SIM and an eSIM active together, so you can have both options at once.
• Local rules: some countries restrict voice-over-IP calling or require SIM registration. A data plan cannot change those rules.
• Sharing: if you need to tether a laptop, confirm the plan allows it, because some plans restrict hotspot sharing.

Our recommendation

For most travellers on trips of a week to a month outside a roaming-friendly zone, a travel eSIM is the best balance of price and effort. Use roaming if your carrier includes your destination or offers a cheap daily pass and you want zero setup. Use a local SIM if you are staying for months or need a local number.

If you go the eSIM route, look at the plans for your destination side by side, check that the data and validity match your trip, and install it at home before you leave. Our country pages are built for exactly that comparison, with data, validity, 5G, tethering and throttling terms shown next to each plan.